Brake tester



Aug. 23,1927. A 1,639,884

F. DOWR ELlO BRAKE TESTER v Filed Novjls. 1926 INVENToR.

ATTORNEYS.

' Patented Aug. 23, 1927.

rmx nownELIo, or OAKLAND, cnnnlomlvnnI Y BRAKE TESTER.

Application :Bled November 18, 1926. 'Serial No.a 149,027.

This invention relates to brake adjusting devices'and particularlypertains to a tester for accurately determining the resistance ofautomobile brakes so that the latterv may be equalized on ,all thewheels of an automotive vehicle.

the handle as shown.

otal connection between the link 11 and the handle 12 occursintermediate the ends of The inner end of the jhandle pivotallyconnects'with a plunger 14 `Tof a pressure gage 15.

lt is the principal object of the present;

invention to provide a simple and inezpen-'l4 sive device which may beengaged with a wheel 'of a vehicle to rotate the same against.

the actionof its brake to accurately indicate the amount of torquerequired to initiate rotation of the Wheel when the brake is set. lncarrying out this object into practice l5 provide a two-part lever whichmay be detachably engaged with a'wheel of an antomobile for rotating it.This lever is formed in two relatively movably parts between which apressure gage is interposed, so that the torque required to .initiaterotation of the wheel against the action of its brake will be visiblyindicated.

One form which the invention may assume is exemplified in the followingdescription and illustrated by way of example in the accompanyingdrawings, in which:

Fig. 1 is a view of an autcmobile'wheel showing the manner in which thedevice is connected therewithv for operation.

Fig. 2 is a fragmentary view in perspective showing the manner in whichthepres-` sure gage is connected to the adjacent parts of the lever.

lin order to obtain proper bralng action o't automobile brakes, it isnecessary' that the brake on all of the wheels be equalized. Toaccomplish this it is necessary that the resistance of .the brake oneach wheel be exactly the same. By means of my present invention l haveprovided a device which will accurately determine the torque required toinitiate rotation of the wheel against the action of its brake. n thismanner the brakes may be adjusted so that their resistance will beequal.

lReference being had to Fig11 it is seen that l have provided a rigidlever 10 of a length that it may be disposed diametrically of anautomobile wheel. This lever rests upon the hub lofthe `vehicle and 'oneof its ends is adapted to be engaged with one of the rim lugs.r Theother end' of the wheel lever is pivotally connected to a vertical link11 which depends downwardlynd is pivotally connected to a handle 12. Thepiv- AVV*plunger in the pressure gage.

The pressure gage 15 is rigidly secured on the wheel lever 10 So thatoscillation of the handle will vertically7 reciprocate the This pre:-sure gage may be of any preferred design which will translate thepressure applied to the end of the handle into pounds pressure. lnoperation of the device, the wheels ot the vehicle are disengaged fromthe ground so that they may rotate. The brakes are then set.-i Afterthis has been done the lever` is applied to the wheel, as shown in Fig.1, and pressure is brought to bear on the outer pressure.

braking action of all the wheels.

end of the handle to turn the wheel. When' suicient pressure has beenapplied to the handle to initiate rotation of the wheel, the reading ofthe pressure gage is noted and the brakes of all the wheels are adjustedso that they will commencefrotating under the saine By this means, adesired resistance of the brakes may be obtained and all of the brakesaccurately set to offer the same resistance. This resultsA in perfectequalization of the Thedink connection between the handle and the leverbar permits the plunger ot the pressure gage to move in a perfectvertical direction, eliminating wear andiother disadvantageous eects. f'e@ lit is obvious that l have provided a simple and inexpensive devicefor testing brakes, which will be comparatively inexpensive tomanufacture, easily operated and capable et use in adjusting the brakes.Likewise, that the braking action of all the wheels et the vehicle maybe determined and' equalized.

,various changes may be made in its con- While I have shown thepreferred form of my invention, it is to be understood that struction bythose skilledin the art without i departing from the spirit ci theinvention,

as defined in theappended claim.

Having thus described my invention, what -l claim and desire to secureby Letters Pattot ent is: A brake testing device` comprisin a leveradapted to be arran ed diametrica lyo a y wheel over the hub t ereo oneepd of the lever being adapted to engage a rim lug of ao the wheel, ahandle disposed substantially connection between said plunger an'd theinparallel tothe lever, a link connecting the ner end of the handlewhereby pressure. lever t0 th handle, the point of connection brought toloearV on the outer end of' the 10 betweenthe link and the handle beingdishandle will operate thev gage, and through 5 posed intermediate theends of the latter, a the gage impart turning movement to\the pressuregage" secured to the lever, said preslever to rotate-the wheel. suregage having afeciprocable plunger, a FRANK DQWRELIO.

